Rotary fan.



No. 888,887 PATENTBD SEPT. 24,1907. J. R. ROBINSON:

ROTARY FAN.

APPLIoATIoN FILED APE.11.1806.

2 SHEETS-SHEET 1.

PATENTBD SEPT. 24, 190'?.

J. R. ROBINSON.

ROTARY FAN.

APPLIOATION FILED APR. 11,1906.

2 SHEETS-SHEET 2.

JAMES R. ROBINSON, OF PITTSBURG, PENNSYLVANIA.

ROTARY FAN.

Specification of Letterslatent.

Patented Sept. 24, 1907.

Application filed pril 1l, 1906. Serial No. 311,138.

To all 'whom 'itt/nay concern:

Be it known that I, JAMES R. ROBINSON, a citizen of the United `States, residing at Pittsburg, in the county otAlleglieny and State of Pennsylvania, have invented a new anduseful Rotary Fan, of which the following is a specification.

This invention relates to rotary fans, and has for its object to provide an improved fan particularly designed for use in mines and other places where itis desired to supply air und er high pressure or to exhaust air where great suction is required. I

It is furthermore designed to have the fan take the air in at the center thereof and discharge it through the periphery of the fan, and in this connection to have one side of the fan closed, and the other side open in order that air may be taken in at one side only.

A further object of the invention is to provide a novel assemblage oi the hub and the blades of the fan, Whereby the number of full llength blades may be reduced to the miniinum and at the saine'time maintain the desiredstrength and rigidity and to draw in the air through the open side of the fan, a plurality of short peripheral .blades being employed between the full length blades for the purpose of discharging the air in a powerful current through the periphery of the fan.

With these and other objects in view, the present invention consists in the combination and arrangement of parts as will be hereinafter more fully described, shown in the accompanying drawings and particularly pointed out in the appended claims, it being understood that changes in the form, proportion, size and minor details may be made, within the scope of the the line 3 3 of Fig. l..

Like characters of reference designate corresponding parts in all of the figures of the drawings.

The present fan includes a substantially 'cylindrical hub l having a central shaft opening 2 and provided at one end with a conical ange 3 which flares out- `tvardly and constitutes a he'ad which is provided with an outer peripheral rim 4 disposed in a vertical plane.

lThis hub is keyed or4 otherwise rigidly' secured to a shaft 5 which is mounted in bearings 6 at one side of the fan and carries a drive pulley 7. As disclosed inv Fig. 2 of the drawings, the shaft is projected at the flanged end ot' the hub and the bearings 6 and 7 are carried by an opstanding bifurcated bracket 8, one ann 8 of which is extended into the conical Harige or head 3 so as to bear against the adjacent end of the hub and thereby prevent endwise play of the hub. Extending longitudinally upon the exterior of the hub is a series o integral ribs 9, three of such ribs being shown in Fig. l and spaced at regular intervals. Each '6I rib 9 is continued upon the flange or head 3, as shown at 10, and is disposed tangentially with respect to the hub. 1t will here be explained that the hub, which includes the body l, vthe head or flange 3 and the ribs 9 and 10 is an integral casting and is mounted upon the 6i shaft as a Whole.

Each full length blade 11, of which there are three, one for each rib 9, is of plate metal with its inner relatively narrow end connected to one of the ribs S35-by suitable fastenings 12, that portion which engages'the 7L hub or flange 3 is inclined to engage the head throughout the length of the latter and is secured to the adjacent rib 10 by suitable fastenings 13. From the outer periphery of the head 3, the adjacent edge 14 of the blade is disposed radially with respect to the shaft, .75l

while the longitudinal edge 15 of the blade inclines outwardly and extends beyond the adjacent end pf the hub, the outer wide end of the blade projecting equally at'fpposite sides of the middle of the hub.

For the purpose of connecting the outer ends of the 89 the inner side of the fan there is a ring 19 of consider'- 85 ably greater width than the ring 16 and extending throughout the radial inner edge portion 14 of the blade, which edge portion of the blade is secured to a substantially radial flange 20 provided upon the inner face of the ring 19. By preference, the flange 20 is in l90 the nature of an angle bar which is riveted 'or otherwise rigidly connected to the ring 19.

` By reference to Figs. land 3 of the drawings, it will be noted that as one portion of the inner end of the blade is connected to the tangentially disposed rib 10,

The blade is secured to what is' the front sides of the 100 i.

ribs 9 and 10 with respect to the direction of rotation of the fan, as indicated by the arrow on Fig. 1, whereby each full length blade presents a convexed front face to the air which is acted upon by the fan.

Upon reference to Fig. l ofthe drawings, it will be noted that the portion llt of the fan which is connected to the ring 16 is bowed to present a front concaved face, l

and the lange 20, to which the innerl edge portion of the blade is secured, terminates short of the outer edge of the ring 19 to permt'of the concaved portion 11 of 110 the blade being inclined rearwardly with respect to the direction of rotation of the fan..

inner end 23 having a concentric opening to accom-` modate the shaft, the peripheral Wall of said opening being reinforcedy by ailanged ring 24 suitably secured to said Wall. The outer end 25 of the case has a concentricopening 2G, the wall of which is reinforced by a ilanged ring 27, the outer peripheries of the ends 23 and 25 being eccentric to the axis of the fan and con.

nected by a peripheral Wall 28.

lt will now be understood that the fan is disposed eccentrically vrithinthe casing so as to provide a gradually increasing annular space between the periphery oi the fan and the casing leading to the outlet 29 of the latter which is located at the bottom thereof and extends horizontally therefrom.

The present peculiar assemblage of the full length blades and the hub produces the desired strength and rigidity for the blades in avery simple and efiici'ent manner, whereby arms radiating irom the hub and other extraneous stitiening ineans are obviated, thereby producinga relativelyvlight tan, while atthe same timel maintaining the necessary strength and durability thereot.

HavingA thus described the invention,what is claimed is: A

1. A rotary fan comprising n hub having a head, longiY tudinal ribs upon the hub, ribs upon the head leading from the ribs of the hub and disposed tangentially with respect to the vairis of the fan, a radial ring carried .by the outer periphery of the head, anges upon the ring and disposed radially and terminating snort of the outer edge ot the ring, and blades connected to the ribs of the hub and the head und to the flanges of the ring, the outer end portion-of each blade beyond the flanges being inclined rearwardly with respect to the direction of rotation of the fan, A

2. A rotary VVfan comprising a hub, full length carried by the hub, rings connecting the respective edges of the blades, and a series of short peripheral blades located between successive full length blndes and carried by the rings.'

3. A 'rotary fan comprising a hub having a head, full length blades carried by the hub and the head, rings connecting the outer portions of the respective longitudinal edges of the blades, and a series of short peripheral blades between successive full length blades and carried by the rings.

4, A rotary fan comprising a hub, substantially tangential blades carried by the hub, rings connecting the outer portions of the respective longitudinal edges of the blades, und a series of4 short peripheral blades disposed between successive tangential blades Aand carried by the rings, the peripheral and tangential blades being inclined rearwardly with respect to the direction of rotation of the fan.

in testimony that I claim the foregoing as my own, I have hereto aixed my signature 'in the presence o'f two witnesses.

JAMES R. ROBINSGN.

'Witnesses ADDISON rBonnie, Rn'eI-JKAH RIDDLE.

blades 

